There is no secret in it. Just two selected Schroder algrorithms:
1)
11 wells
Well width 6 cm
Well depths:
2,8,18,10,6, 6, 10, 18, 8, 2, 0 cm
about 1 cm ribs in between each well
Size 70x140cm
2) 7 wells
Well width 5,7 cm
Well depths:
3,12,6,6,12,3, 0 cm
Size 45x90 cm
Now I am looking for some tips (and photos) for simple cylindrical polydiffusers